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See: https://docs.microsoft.com/en-us/windows-server/identity/ad-fs/operations/create-a-relying-party-trust for details of how to setup a Relying Party Trust in the current version on ADFS on Windows 2016, which is how iShareGIS will operate in an ADFS environment. The method will be similar but not identical in Windows 2012 and Windows 2008.
While configuring ADFS itself is outside of the scope of iShare documentation or consultancy, the following are what we understand are the necessary steps to enable iShareGIS to be a Relying Party Trust:
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